Arp

Family: Lamiaceae Herb

Planting Schedule

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Fragrant as a sunlit hillside, Arp rosemary fills the garden with a resinous, pine-needle perfume and delivers bold, savory sprigs that hold their character from fresh harvest to drying.

The foliage is deep forest-green and notably aromatic, with a refined, upright habit that makes it easy to gather generous armfuls for flavorful bundles. Arp is a standout for home gardeners seeking a reliable, long-season rosemary for seasoning blends, infusions, and aromatic oils—an herb that turns everyday meals into something memorable.

Light: Full SunMaturity: 90 DaysHabit: Upright

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Arp Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	May 18th	Jul 27th	Oct 25th – Jul 15th
Zone 1b	May 4th	Jul 13th	Oct 11th – Aug 1st
Zone 2a	Apr 27th	Jul 6th	Oct 4th – Aug 29th
Zone 2b	Apr 17th	Jun 26th	Sep 24th – Aug 25th
Zone 3a	Apr 17th	Jun 26th	Sep 24th – Sep 1st
Zone 3b	Apr 21st	Jun 30th	Sep 28th – Sep 21st
Zone 4a	Apr 17th	Jun 26th	Sep 24th – Sep 24th
Zone 4b	Apr 15th	Jun 24th	Sep 22nd – Sep 27th
Zone 5a	Apr 10th	Jun 19th	Sep 17th – Sep 30th
Zone 5b	Apr 6th	Jun 15th	Sep 13th – Oct 5th
Zone 6a	Apr 3rd	Jun 12th	Sep 10th – Oct 10th
Zone 6b	Mar 28th	Jun 6th	Sep 4th – Oct 16th
Zone 7a	Mar 23rd	Jun 1st	Aug 30th – Oct 20th
Zone 7b	Mar 13th	May 22nd	Aug 20th – Oct 28th
Zone 8a	Mar 4th	May 13th	Aug 11th – Nov 5th
Zone 8b	Feb 23rd	May 4th	Aug 2nd – Nov 12th
Zone 9a	Feb 6th	Apr 17th	Jul 16th – Nov 26th
Zone 9b	Jan 12th	Mar 23rd	Jun 21st – Dec 9th
Zone 10a	—	Oct 1st	Dec 30th – Feb 28th
Zone 10b	—	Oct 1st	Dec 30th – Feb 28th
Zone 11a	—	Oct 1st	Dec 30th – Feb 28th
Zone 11b	—	Oct 1st	Dec 30th – Feb 28th
Zone 12a	—	Oct 1st	Dec 30th – Feb 28th
Zone 12b	—	Oct 1st	Dec 30th – Feb 28th
Zone 13a	—	Oct 1st	Dec 30th – Feb 28th
Zone 13b	—	Oct 1st	Dec 30th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	60
Min Night Temp (°F)	35
Harden Off (days)	7

Culinary Notes

Chef's Note

Arp rosemary is built for the long haul: its resinous, aromatic punch holds steady from fresh picking through drying, so you get that piney savor in the final bite. Use it to perfume fat (oil/butter) or meat—its intensity won’t disappear and it won’t taste weedy if you give it heat time.

Best Uses

dry-rub roasts and lamb with rosemary twigs that stay fragrant through high heat
infuse olive oil or butter for finishing—let it perfume the fat, not just the surface
stir sprigs into beans, lentils, or chickpeas near the end to avoid going harsh
use dried rosemary in slow sauces where it can rehydrate and soften

Flavor Profile

resinous pine-needle aroma savory, lightly bitter herbal bite intense when heated, perfumes the fat stands up to drying with a still-green, woody finish

Kitchen Pairings

garlic lemon olive oil butter lamb roasted potatoes

Frequently Asked Questions

How do I manage powdery mildew on Arp squash (or squash-type cucurbits) during warm, humid weather?

Powdery mildew shows up as a white, dusty coating on Arp leaves, often starting on older foliage. Remove the most infected leaves early and space plants farther apart to improve airflow; water at the base so the leaves stay dry. If it keeps spreading, spray an approved powdery mildew fungicide labeled for cucurbits and repeat according to the label interval.

How often should I water Arp during the main growing phase to avoid stunted growth and poor fruit set?

From flowering through fruit enlargement (roughly mid-season to around the last few weeks), keep the soil consistently moist but not soggy—aim for about 1 inch of water per week total, split into 1–2 deep waterings. Check by pushing a finger 1–2 inches into the soil; water if it feels dry at that depth. Avoid letting the soil fully dry out between waterings, since Arp cucurbits can drop blossoms and develop small, uneven fruit.

When is Arp ready to harvest, and how can I tell without guessing?

Harvest Arp when the rind has fully hardened and the fruit has reached the mature size for the variety, typically around 90 days from sowing. The skin should be difficult to puncture with a fingernail, the stem should begin to dry, and the fruit should sound a bit more solid when tapped. Cut the fruit with a sharp knife, leaving a short stem, and cure it if your storage needs require it.